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Diffstat (limited to 'gfx/angle/src/libANGLE/renderer/d3d/d3d9/vertexconversion.h')
-rwxr-xr-x | gfx/angle/src/libANGLE/renderer/d3d/d3d9/vertexconversion.h | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/gfx/angle/src/libANGLE/renderer/d3d/d3d9/vertexconversion.h b/gfx/angle/src/libANGLE/renderer/d3d/d3d9/vertexconversion.h new file mode 100755 index 000000000..aa05934bc --- /dev/null +++ b/gfx/angle/src/libANGLE/renderer/d3d/d3d9/vertexconversion.h @@ -0,0 +1,200 @@ +// +// Copyright (c) 2002-2010 The ANGLE Project Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. +// + +// vertexconversion.h: A library of vertex conversion classes that can be used to build +// the FormatConverter objects used by the buffer conversion system. + +#ifndef LIBANGLE_RENDERER_D3D_D3D9_VERTEXCONVERSION_H_ +#define LIBANGLE_RENDERER_D3D_D3D9_VERTEXCONVERSION_H_ + +#include <limits> +#include <cstdint> +#include <cstddef> + +namespace rx +{ + +// Conversion types: +// static const bool identity: true if this is an identity transform, false otherwise +// static U convert(T): convert a single element from the input type to the output type +// typedef ... OutputType: the type produced by this conversion + +template <class T> +struct Identity +{ + static const bool identity = true; + + typedef T OutputType; + + static T convert(T x) + { + return x; + } +}; + +template <class FromT, class ToT> +struct Cast +{ + static const bool identity = false; + + typedef ToT OutputType; + + static ToT convert(FromT x) + { + return static_cast<ToT>(x); + } +}; + +template <class T> +struct Cast<T, T> +{ + static const bool identity = true; + + typedef T OutputType; + + static T convert(T x) + { + return static_cast<T>(x); + } +}; + +template <class T> +struct Normalize +{ + static const bool identity = false; + + typedef float OutputType; + + static float convert(T x) + { + typedef std::numeric_limits<T> NL; + float f = static_cast<float>(x); + + if (NL::is_signed) + { + // const float => VC2008 computes it at compile time + // static const float => VC2008 computes it the first time we get here, stores it to memory with static guard and all that. + const float divisor = 1.0f/(2*static_cast<float>(NL::max())+1); + return (2*f+1)*divisor; + } + else + { + return f/NL::max(); + } + } +}; + +template <class FromType, std::size_t ScaleBits> +struct FixedToFloat +{ + static const bool identity = false; + + typedef float OutputType; + + static float convert(FromType x) + { + const float divisor = 1.0f / static_cast<float>(static_cast<FromType>(1) << ScaleBits); + return static_cast<float>(x) * divisor; + } +}; + +// Widen types: +// static const unsigned int initialWidth: number of components before conversion +// static const unsigned int finalWidth: number of components after conversion + +// Float is supported at any size. +template <std::size_t N> +struct NoWiden +{ + static const std::size_t initialWidth = N; + static const std::size_t finalWidth = N; +}; + +// SHORT, norm-SHORT, norm-UNSIGNED_SHORT are supported but only with 2 or 4 components +template <std::size_t N> +struct WidenToEven +{ + static const std::size_t initialWidth = N; + static const std::size_t finalWidth = N+(N&1); +}; + +template <std::size_t N> +struct WidenToFour +{ + static const std::size_t initialWidth = N; + static const std::size_t finalWidth = 4; +}; + +// Most types have 0 and 1 that are just that. +template <class T> +struct SimpleDefaultValues +{ + static T zero() { return static_cast<T>(0); } + static T one() { return static_cast<T>(1); } +}; + +// But normalised types only store [0,1] or [-1,1] so 1.0 is represented by the max value. +template <class T> +struct NormalizedDefaultValues +{ + static T zero() { return static_cast<T>(0); } + static T one() { return std::numeric_limits<T>::max(); } +}; + +// Converter: +// static const bool identity: true if this is an identity transform (with no widening) +// static const std::size_t finalSize: number of bytes per output vertex +// static void convertArray(const void *in, std::size_t stride, std::size_t n, void *out): convert an array of vertices. Input may be strided, but output will be unstrided. + +template <class InT, + class WidenRule, + class Converter, + class DefaultValueRule = SimpleDefaultValues<InT>> +struct VertexDataConverter +{ + typedef typename Converter::OutputType OutputType; + typedef InT InputType; + + static const bool identity = (WidenRule::initialWidth == WidenRule::finalWidth) && Converter::identity; + static const std::size_t finalSize = WidenRule::finalWidth * sizeof(OutputType); + + static void convertArray(const uint8_t *input, size_t stride, size_t n, uint8_t *output) + { + OutputType *out = reinterpret_cast<OutputType*>(output); + + for (std::size_t i = 0; i < n; i++) + { + const InputType *ein = reinterpret_cast<const InputType*>(input + i * stride); + + copyComponent(out, ein, 0, static_cast<OutputType>(DefaultValueRule::zero())); + copyComponent(out, ein, 1, static_cast<OutputType>(DefaultValueRule::zero())); + copyComponent(out, ein, 2, static_cast<OutputType>(DefaultValueRule::zero())); + copyComponent(out, ein, 3, static_cast<OutputType>(DefaultValueRule::one())); + + out += WidenRule::finalWidth; + } + } + + private: + static void copyComponent(OutputType *out, const InputType *in, std::size_t elementindex, OutputType defaultvalue) + { + if (WidenRule::finalWidth > elementindex) + { + if (WidenRule::initialWidth > elementindex) + { + out[elementindex] = Converter::convert(in[elementindex]); + } + else + { + out[elementindex] = defaultvalue; + } + } + } +}; + +} + +#endif // LIBANGLE_RENDERER_D3D_D3D9_VERTEXCONVERSION_H_ |